18217634850972 has 36 divisors (see below), whose sum is σ = 46063226443416. Its totient is φ = 6070818281760.

The previous prime is 18217634850959. The next prime is 18217634850977. The reversal of 18217634850972 is 27905843671281.

18217634850972 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 7 + 63 + 485 + 0 + 97 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18217634850977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71816154 + ... + 72069377.

It is a 1-persistent number, because it is pandigital, but 2⋅18217634850972 = 36435269701944 is not.

Almost surely, 2^{18217634850972} is an apocalyptic number.

18217634850972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18217634850972 is an abundant number, since it is smaller than the sum of its proper divisors (27845591592444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18217634850972 is a wasteful number, since it uses less digits than its factorization.

18217634850972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143889058 (or 143889053 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 18217634850972 in words is "eighteen trillion, two hundred seventeen billion, six hundred thirty-four million, eight hundred fifty thousand, nine hundred seventy-two".